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WTM83 and Latitude/Longitude Luap777 05-29-2007
Posted by Luap777 on May 29, 2007, 2:56 pm
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 Greetings,

I'm pretty new to GIS in general. What I want to do is convert
Latitude and Longitude into WTM83/91 (http://www.dnr.state.wi.us/maps/
gis/wtm8391.html). I need to do this from my own code. I've found code
around the internet for converting LL into UTM, is that related to
WTM? and if so, how could I get WTM from that?

I'm an amateur photographer. I carry GPS unit with me when I take
photos. I would love to be able to use the Wisconsin county/township
shapefiles to automatically add more information about where the photo
was taken for searching purposes.

If anyone can give me some guidance on this, I'd be very appreciative.

Thank you,
Paul S.


Posted by scott s. on May 29, 2007, 6:25 pm
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 @k79g2000hse.googlegroups.com:

> Greetings,
>
> I'm pretty new to GIS in general. What I want to do is convert
> Latitude and Longitude into WTM83/91 (http://www.dnr.state.wi.us/maps/
> gis/wtm8391.html). I need to do this from my own code. I've found code
> around the internet for converting LL into UTM, is that related to
> WTM? and if so, how could I get WTM from that?
>
> I'm an amateur photographer. I carry GPS unit with me when I take
> photos. I would love to be able to use the Wisconsin county/township
> shapefiles to automatically add more information about where the photo
> was taken for searching purposes.
>
> If anyone can give me some guidance on this, I'd be very appreciative.
>

Here are the projection parameters for WTM83/91:
Projection TRANSVERSE
Datum NAD83
Zunits NO
Units METERS
Xshift 0.000000
Yshift 0.000000
Parameters
0.999600000 /* scale factor at central meridian

-90 0 0.000 /* central meridian

0 0 0.000 /* latitude of the origin

520000.000 /* false easting (meters)

-4480000.000 /* false northing (meters)

Howver, you might find it useful to check out the program fgis here:
http://www.forestpal.com/fgis.html
the program was developed for DNR/DOF but they ran into licensing
problems, and the last available free version is posted at this URL.

scott s.
.


Posted by ujaval@gmail.com on June 1, 2007, 7:12 pm
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> Greetings,
>
> I'm pretty new to GIS in general. What I want to do is convert
> Latitude and Longitude into WTM83/91 (http://www.dnr.state.wi.us/maps/
> gis/wtm8391.html). I need to do this from my own code. I've found code
> around the internet for converting LL into UTM, is that related to
> WTM? and if so, how could I get WTM from that?
>
> I'm an amateur photographer. I carry GPS unit with me when I take
> photos. I would love to be able to use the Wisconsin county/township
> shapefiles to automatically add more information about where the photo
> was taken for searching purposes.
>
> If anyone can give me some guidance on this, I'd be very appreciative.
>
> Thank you,
> Paul S.

Try the PROJ4 library http://proj.maptools.org/ You can use this in
your application and do the transform.

-ujaval
http://spatialthoughts.com



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